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Rio Wastewater Treatment Facility

Sth 16 - North Of Rio Street, Rio, Wisconsin, Rio, WI 53960 · Columbia County · Publicly Owned Treatment Works

Average flow
—
Design flow
0.12 MGD
NPDES permit
WI0020117
Expired
Permit expires
September 2023
Population served
1,100
CWNS 2022

Rio Wastewater Treatment Facility is a publicly owned wastewater treatment works in Rio, Columbia County, Wisconsin, serving about 1,100 residents. It discharges under NPDES permit WI0020117 (expired), which expires in September 2023, with 2 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Rio Wastewater Treatment Facility.

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Compliance snapshot (last 3 years)

Total violations
2
Effluent violations
2

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

Decision-makers at Rio Wastewater Treatment Facility.

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Nearby wastewater treatment plants in Wisconsin

Cambria Wastewater Treatment Facility

Cambria · 9 mi away

0.06 MGD

1.55 MGD

Friesland Waterworks

Friesland · 13 mi away

0.03 MGD

Village Of Randolph

Randolph · 13 mi away

—

Columbus City WWTF

Columbus · 15 mi away

1.11 MGD

Kingston Village

Kingston · 17 mi away

0.01 MGD

0.33 MGD

City Of Sun Prairie Site

Sun Prairie · 21 mi away

3.41 MGD

Rio Wastewater Treatment Facility: frequently asked questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed October 26, 2026; facility record last updated September 16, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms


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